Partially coated fastener assembly and method for coating

ABSTRACT

A fastener assembly includes a row of fasteners having a head, a tip, and a portion of a shank coated with a polymer composition. The polymer composition includes a polymer material such as polyurethane and metal particles. The polymer composition is used to provide improved corrosion and ultraviolet radiation resistance when used with naturally corrosive or pressure preservative treated wood. The fastener assembly is coated with the polymer composition by vacuum coating a dispersion of the polymer composition in a solvent such as water and removing the solvent.

FIELD OF THE INVENTION

This invention is related to a fastener assembly including a row ofadjacent metal fasteners. The invention is directed to a method forpartially coating the fasteners, particularly a head, a tip, at least aportion of an upper shank portion, and/or (in various combinations) atleast a portion of a lower shank portion of the fasteners, of thefastener assembly with a polymer coating, as well as the partiallycoated fastener assembly. The polymer composition for coating thefasteners includes a pigment material and a polymer material such as apredominantly aliphatic polyurethane.

BACKGROUND OF THE INVENTION

Fasteners, such as nails, staples, brads, and pins, that are to besubjected to exterior or weathering applications are typically made fromwire that has been plated, or galvanized, usually with zinc. Aluminumhas sometimes been introduced in the plating process with zinc forenhanced corrosion performance as well.

The plating step is typically either electrolytic or via a molten zinc,or zinc and aluminum bath or pot. The latter is characterized as a “hotdipping” process.

The steel used for the fastener may be composed of various chemistriesand demonstrate significant property differences depending upon thedegree of cold working through conventional wire drawing practices,differences in the basic steel constituents, and whether or not a stressrelieving (patenting or annealing) process stage has been introduced.

Such plated fasteners are commonly used with pressure treated wood.Pressure treating is used to prevent decay and insect damage to woodused for playground equipment, decks, landscaping ties, and fence posts.Copper chromated arsenate (CCA) has been a common preservation treatmentfor wood. As CCA includes arsenic, alternatives to CCA, such as alkalinecopper quatenary (ACQ), are presently available. The chemical treatmentof pressure treated wood, such as ACQ wood, can react with metalfasteners to corrode the fasteners.

Fast-acting fastener driving tools are commonplace in the buildingindustry. Fasteners, such as nails, are assembled in strips that areadapted for use in a magazine of such tools. The strips are flat, thenails or other fasteners are parallel, and the fasteners are maintainedin position using a collating component, typically including an adhesiveand a backing material, to bind the nails or other fasteners together ina parallel arrangement, to provide a collated strip of fasteners for usein fastener driving tools.

In order to improve the weathering resistance of fastener assemblies foruse with fastener driving tools, particularly when used with treatedwood products, there is a need or desire for a coating which has theability to provide improved corrosion resistance. There is also a needfor improved methods for applying such coatings to fasteners, andparticularly fastener assemblies for use with fastener driving tools.

SUMMARY OF THE INVENTION

The present invention is directed to a fastener assembly including aplurality of fasteners arranged in a row and connected by a collationcomponent. A polymer coating composition coats at least one of thefastener heads, the fastener tips, at least a portion of the shanksbetween the heads and the collation component, and at least a portion ofthe shanks between the tips and the collation component. The fastenerscan be “T” nails, staples, pins, brads or the like, typically made fromsteel having various chemistries and mechanical properties. The polymercoating composition provides improved corrosion protection, particularlywhen used with naturally corrosive or treated wood, such as ACQ woodproducts. The polymer coating composition includes a pigment material,such as aluminum particles. The balance of the coating composition is apolymer material which can include, for example, a polyurethane polymeror a combination of a polyurethane polymer and an acrylic polymer.

The fastener assembly of this invention can be made by a methodincluding applying a protective plating, such as a galvanized zincplating, over substantially all of the metal surface of each fastener toform a plated fastener. A collation component is applied to the platedfasteners. A portion of the fastener assembly is coated, preferably byvacuum coating, with a coating composition including a polymer materialand a pigment material dispersed in a solvent. The solvent is removedupon cooling, leaving a polymer composition coating including thepolymer material and the pigment on the portion of the fastenerassembly.

Vacuum coating is accomplished by creating a vacuum in a coating chamberand subsequently introducing the coating composition into the coatingchamber. The portions of the fastener assembly to be coated, preferablyat least one of the head, the tip, the upper shank portion, and thelower shank portion of each of the fasteners, are introduced into thecoating chamber. The coating composition in the coating chamber coatsthe portion of each fastener within the coating chamber and, uponcoating, the coated portion of the fastener assembly is removed from thecoating chamber.

With the foregoing in mind, it is a feature and advantage of theinvention to provide a fastener assembly having a polymer coating whichprovides corrosion and ultraviolet resistance.

It is also a feature and advantage of the invention to provide a polymercoating composition. The coating composition includes a polymer materialand a pigment material dispersed in water.

These and other features and advantages of the invention will becomefurther apparent from the following detailed description of thepresently preferred embodiments, read in conjunction with theaccompanying examples and drawings. The detailed description, examplesand drawings are intended to be illustrative rather than limiting, withthe scope of the invention being defined by the appended claims andequivalents thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top plan view of a nail assembly according to the invention.

FIG. 2 is a sectional view of a nail assembly according to theinvention, taken along the line 2-2 in FIG. 1.

FIG. 3 is a top plan view of a general representation of a vacuumcoating apparatus according to this invention in combination with afastener assembly.

FIG. 4 is a partial cross-sectional view of the vacuum coating apparatusaccording to the invention, taken along line 3-3 in FIG. 3, incombination with the fastener assembly.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

FIGS. 1 and 2 show a fastener assembly according to one embodiment ofthis invention and provided by the method described below. Referring toFIGS. 1 and 2, a nail assembly, generally designated as 50, is arrangedin a flat planar configuration with a plurality of nails parallel toeach other. The nail assembly 50 is useable in a metal fastener drivingtool having an angled magazine. The nail assembly includes two essentialcomponents, a plurality of nails 49 and at least one (desirably two)collation component. The collation component holds the individualfasteners together in the desired fastener assembly arrangement. As willbe appreciated by one skilled in the art, various types of collationcomponents as known in the art are available for use with the fastenerassembly of this invention. The collation component shown in FIGS. 1 and2 is a collation tape 55. An example of a suitable collation tape isdisclosed in commonly assigned U.S. Pat. No. 5,733,085, issued on 31Mar. 1998 to Mitsuzo et al., herein incorporated by reference.

As shown in FIGS. 1 and 2, the collation tape 55 includes adhesivelayers 56 and 58 bonded to the nails and holding them in a parallelconfiguration with spaces 53 between the nails 49. In the preferredembodiment shown, the two adhesive layers 56 and 58 sandwich the row ofnails between the layers. The adhesive layers 56 and 58 are covered ontheir outer surfaces by backing layers 54 and 57, preferably constructedof paper or brittle plastic. The backing layers can be used to reinforcethe adhesive layers 56 and 58, and can also be used for printing andlabeling. A preferred backing layer is brown kraft paper, which isstrong and tends to blend in with the color of the wood being penetratedby the nails. As will be appreciated by one skilled in the art, othercollation means and components known in the art can be used in form thefastener assembly of this invention.

Each of the nails 49 has a head 51, a triangular shaped tip 47 on anopposite end from the head 51, and a shank 48 between the head 51 andthe tip 47. As shown in FIG. 1, the heads 51 of adjacent nails partiallyoverlap each other. Furthermore, the head 51 of each leading nailpreferably touches the shank 48 of the closest trailing nail, in orderto help maintain the alignment of the nails.

The shank 48 can have various cross-sectional shapes, such as round,square rectangular, oval, and polygonal. The shank 48 includes an uppershank portion 46 and a lower shank portion 45. As used herein, the“upper shank portion” of the fastener refers to the portion of the shankbetween the fastener head and an edge of the attached collationcomponent closest the fastener head. As used herein, the “lower shankportion” of the fastener refers to the portion of the shank between thefastener tip and an edge of the attached collation component closest thefastener tip. As will be appreciated by one skilled in the art followingthe teachings herein provided, the collation component can vary in widthand can be attached at various positions on the shank. Thus, the size ofthe upper shank portion and the lower shank portion can vary dependingon the size of the fastener, the size of the collation component, andthe location of attachment of the collation component on the fastenershank.

The nails 49 are slanted relative to the collation tape 55. The degreeof slanting is between about 10-40 degrees, preferably about 15-25degrees, where a zero degree slant is perpendicular to the collationtape 55. This slanting is what permits the round head 51 to overlap whenthe nails are in uniform parallel alignment. By overlapping the heads51, the distance between the adjacent nail shanks 48 can be less thanwould be required if the nails were aligned perpendicular to thecollation tape 55 with the respective head portions positioned edge toedge. The distance between shanks can be further reduced by providingthe nail heads with a truncated circular shape (e.g., a half circle orthree-quarter circle with a flat edge) instead of making them completelyround.

The fasteners of this invention can be constructed of any metal commonlyused for fasteners, including steel, cooper, aluminum, zinc and variousother metals and metal alloys. For instance staples and nails arecommonly formed from carbon steel. The fasteners of this invention canbe plated, or galvanized, by means, such as electrolytic plating, andmaterials, such as zinc, known in the art to provide improved corrosionresistance. The fasteners can be plated over substantially all, anddesirably all, of the metal surface of the fastener.

The fastener assembly of this invention includes a polymer compositioncoating at least one of the head, the tip, at least a portion of theshank between the head and the collation component, and at least aportion of the shank between the tip and the collation component. Thepolymer composition coating provides improved corrosion resistance tothe coated portion(s) of the individual fasteners, particularly when thefasteners are driven into pressure treated wood. As shown in FIG. 1,each of the nails 49 includes a polymer composition coating 60 on thehead 51 and a portion of the upper shank portion 46, as well as the tip47 and a portion of the lower shank portion 45. The polymer compositioncoating 60 partially coats the upper shank portion 46 of the shank 48,from the head 51 to a polymer composition coating edge 62 above thecollation tape 55. The polymer composition coating 60 also partiallycoats the lower shank portion 45 of the shank 48, from the tip 47 to apolymer composition coating edge 63 below the collation tape 55. Asdiscussed above, the length of the upper shank portion and the lowershank portion relative to the total length of the shank is dependent onthe placement and size of the collation component.

As will be appreciated by one skilled in the art following the teachingsherein provided, the entire fastener assembly, including the collationcomponent, can be coated according to this invention and the methodsdescribed herein. In another embodiment the collation component can beonly partially coated such as along with the upper and/or lower shankportions. In one desired embodiment of this invention, the collationcomponent is not coated with the polymer composition, and only the head,tip, upper shank portion and/or lower shank portion of each fasteneris/are desirably coated. Not coating the collation component isparticularly desirable when the collation component includes text orgraphics that would be hidden if coated by the polymer composition ofthis invention.

In one embodiment of this invention, the portion of each fastener thatis coated is less than about 50% of a total length of the platedfastener, more suitably about 10% to about 20% of the total length ofthe plated fastener. In another embodiment, about ⅜ inch (about 0.95centimeters) or less of the shank directly adjacent to at least one ofthe head and the tip includes a coating of the polymer composition.

The polymer composition used for coating the head and upper shank of thefastener includes a polymer material and a pigment material. The polymermaterial can include any synthetic or natural polymer, as well aspolymer combinations. Preferred polymer materials contemplated by thisinvention include water-dispersible, thermoplastic polymer materialsthat contain as a major constituent thereof a film-forming aliphaticpolyurethane polymer. As used herein, the term “aliphatic” includesstraight-chain aliphatic as well as alicyclic or cycloaliphaticpolyurethane resins. In one embodiment of this invention the polymercomposition includes (on a dry weight basis) about 50% to about 95% byweight polymer material and about 5% to about 50% by weight pigmentmaterial, more suitably about 70% to about 95% by weight polymermaterial and about 5% to about 30% by weight pigment material, anddesirably about 80% to about 90% by weight polymer material and about10% to about 20% by weight pigment material. One suitable polymermaterial includes a polyurethane polymer. The polymer material caninclude additional polymers, such as acrylic polymers, alone or incombination with the polyurethane polymer. Suitable acrylic polymersinclude Neocryl® A -622 and Neocryl® A -623, available from NeOResins,Wilmington, Mass., as well as Maincote™ HG56, available from Rohm & HaasCompany, Philadelphia, Pa. The polymer composition can also includeadditional filler materials, such as corrosion protection materials andultraviolet radiation protection materials, for additional protection.

In one embodiment of this invention, the pigment material includes metalparticles. The metal particles can be formed of various metalsincluding, for example, aluminum, zinc, tin, cadmium, copper, bronze,magnesium, or combinations thereof. The metal particles can be in theform of regular or irregular shaped particles including spheres,diamonds, flakes, and a wide variety of other shapes. The metalparticles may have an average particle diameter of about 1-100 microns,suitably about 5-75 microns, desirably about 10-50 microns. If theaverage particle size is too large, the metal polymer composition may bedifficult to extrude or otherwise apply to the fasteners. If the averageparticle size is too small, the metal particles may behave like clumpsof dust that are difficult to disperse in the polymer.

In one preferred embodiment of this invention, the pigment materialincludes aluminum particles. The aluminum particles can be in the formof aluminum powder or aluminum paste. Aluminum paste typically includesaluminum particles in a solvent, such as mineral spirits. Examples ofaluminum pastes useful as the pigment material of this invention aresold under the name Aquasil®, available from Silberline®, Tamaqua, Pa.,in particle sizes ranging from about 18.8 microns to 55.2 microns. Usingaluminum or other metal particles as the pigment material has a benefitof matching or blending with the metallic coloration of the galvanizedfastener.

Other pigment materials, such as those known in the art, can also beused in the polymer composition of this invention. In one embodiment ofthis invention, the pigment material is an organic pigment. In anotherembodiment of this invention the pigment material is pearl essence.

In one embodiment of this invention, the polymer composition can beincluded in a coating composition for applying the polymer compositionto the fastener assembly, more particularly at least one of the heads,the tips, a portion of the upper shank portion, and a portion of thelower shank portion of the fasteners. The coating composition includesthe polymer composition discussed above dispersed in a solvent. In oneembodiment, the coating composition is an aqueous coating compositionwherein the polymer composition is dispersed in water. Other solventscan also be used instead of water, preferably solvents that evaporatereadily, such as acetone, to facilitate efficient removal of the solventduring drying. The coating composition of this invention suitablyincludes about 5% to about 30% solids, desirably about 15% to about 20%solids, to reduce, and preferably eliminate, polymer compositionbridging the space between the individual fasteners of the fastenerassembly. In other words, if the amount of solids in the coatingcomposition is too high, the coating composition upon drying canundesirably form a film of the polymer composition between theindividual fasteners, such as forming a polymer composition film overthe spaces 53 between the nails 49 as shown in FIG. 1, as well ascoating the desired portion of the individual fasteners.

The aqueous coating composition can be applied to each individualfastener, by such methods as described below, so as to provide, upondrying to remove the water or other solvent, a polymer compositiondeposited on the fastener as a substantially continuous film encasingthe fastener and having a thickness of about 0.2 mils to about 5.0 mils,suitably about 1.0 mil to about 3.0 mils. Upon removal of the water orother solvent, an aliphatic polyurethane resin may include crosslinkedaliphatic polyurethane chains.

In one embodiment of this invention, a method for forming a fastenerassembly includes applying a protective plating, such as a zinc plating,over all, or at least substantially all, of the metal surface of theindividual fasteners to form plated or galvanized fasteners. Thefasteners can optionally be cleaned and are then arranged in a row andthe collation component is applied to form the fastener assembly. Thecoating composition is applied to a portion of the fasteners, moreparticularly at least one of the heads, the tips, at least a portion ofthe upper shank portion, and at least a portion of the lower shankportion, by vacuum coating, followed by removing the water or othersolvent, leaving a coating of the polymer composition including thepolymer material and the pigment material on the portion of the platedfastener.

Vacuum coating refers to the deposition of a film or coating in a vacuumor an otherwise low pressure environment. Vacuum coating the fastenerassembly can be accomplished by creating a vacuum in a coating chamber.As used herein, a “vacuum” refers to a space or area, such as within thecoating chamber, in which the pressure is lower than the ambientpressure. The coating composition is introduced, such as by spraying,into the vacuum in the coating chamber, resulting in filling, orflooding, the coating chamber with the coating composition. The portionof the fastener assembly to be coated, such as, for example, the headand upper shank portion, is introduced in the coating chamber, resultingin the coating of the portion of the fastener assembly. Upon coating,the portion of the coated fastener assembly is removed from the coatingchamber.

Upon removing the coated fastener assembly from the coating chambervacuum, any excess coating is generally wiped off by the onrushing air.The onrushing air also facilitates drying the coating composition toremove the water or other solvent. In addition, the vacuum coatingprocess can have a cooling effect on the fastener assembly. The fastenerassembly is typically heated during application of the collationcomponent, often as high as 450° F. (about 232° C.), and cooled beforevacuum coating, desirably to less than about 200° F. (about 93° C.), andmore desirably at least as low as about 140° F. (about 60° C.) to 160°F. (about 71° C.). The vacuum coating process disclosed herein furthercools the fastener assembly. As the fastener assembly is generally notpackaged when hot, this cooling effect can provide the additionalbenefits of requiring fewer production steps, i.e., additional dryingtime and machinery are not needed, allowing for faster packaging.

The coating composition can be applied to the fastener assembly bymethods other than vacuum coating. For example, the coating compositioncan be applied by spraying the coating composition on the fasteners orpartially dipping the fastener assembly into the coating composition anddrying the coating composition, such as by blowing, to remove the wateror other solvent.

A preferred method for making a fastener assembly according to thisinvention includes providing a plurality of fasteners. The fasteners canbe formed from wire stock. A plating, typically a zinc plating, isapplied to the wire stock to form galvanized wire stock. The fastenersare formed by cutting galvanized wire stock into cut wire segments andforming a head on one end of the cut wire segments. The fasteners arecleaned by cleaning methods known in the art, such as known alkalinecleaning systems.

The fasteners are arranged in a row on a conveyor, such as aconventional band conveyor. The fasteners are maintained in aconfiguration that exposes one or both sides of the row of fasteners toapplication of at least one collation component on at least one side ofthe fasteners shanks using heat and pressure, thereby providing afastener assembly, such as shown in FIGS. 1 and 2. After the fastenerassembly is heated to apply the collation component, the fastenerassembly is at least partially cooled before partially coating thefastener assembly with a coating composition, suitably to a temperatureof less than about 200° F. (about 93° C.), and desirably at least about140° F. (about 60° C.) to about 160° F. (about 71° C.).

A coating composition is prepared by mixing a polymer composition, suchas described above, including a polymer material and a pigment materialin a solvent such as water. The coating composition is applied to atleast one of the fastener heads, the fastener tips, at least a portionof the fastener upper shank portions, and at least a portion of thefastener lower shank portions. The coating composition is applied byvacuum coating. The head, tip, portion of the upper shank portion,and/or portion of the lower shank portion is/are passed through thecoating chamber through an opening in the coating chamber. The coatingchamber is flooded with the coating composition, which coats the portionof each of the fasteners within the coating chamber.

Upon coating, the fastener assembly exits the coating chamber and thewater or other solvent is removed from the coating composition, leavinga coating of the polymer composition on the respective portion of eachfastener in the fastener assembly, and the fastener assembly is cooledfor packaging. The onset of air upon exiting the vacuum of the coatingchamber at least partially removes the solvent from the coatingcomposition, as well as at least partially cools the fastener assembly.

The coated fastener assemblies of this invention can be assembled alonga conveyor, creating a long strip of fastener assembly. The fasterassembly can be cut into segments, or shorter fastener assemblies,having a desired size for packaging.

FIGS. 3 and 4 show a general representation of a vacuum coatingapparatus 100 according to one embodiment of this invention and usefulfor vacuum coating a fastener assembly. The vacuum coating apparatus 100includes a coating storage chamber 102 and a coating chamber 104. Thecoating storage chamber 102 is connected to the coating chamber 104 by aspray line 106 and a return line 108. A coating pump 110 in combinationwith the spray line 106 and the return line 108 pumps the coatingcomposition 120 into the coating chamber 104 through nozzle 114. Avacuum pump 111 connected to the coating storage chamber 102 creates avacuum environment in the coating chamber 104 by removing air in thecoating chamber 104 through intake 112.

The nail assembly 50 travels from the nail collating machine (not shown)on two conveyor bands 75. Each of the conveyor bands 75 is desirablypositioned on either side of the collation tape 55, and the bandconveyors can include notches to hold the individual nails 49 of thenail assembly 50. The nail assembly 50 travels on the conveyor bands 75to the coating chamber 104. The coating chamber includes an opening 105across a face 122. The opening 105 partially extends into both a firstside wall 124 and a second side wall 126 of the coating chamber 104. Theopening 105 is configured to allow the head portions 51 and the uppershank portions 46 of the nail assembly 50 to enter the opening 105 atthe first side wall 124 and travel through the coating chamber 104 andexit the opening at the second side wall 126.

The coating composition 120 is introduced into the coating chamber 104as a spray 115 though nozzle 114. The coating composition fills thecoating chamber 104 and coats the portion of the nail assembly 50passing through the coating chamber 104, more particularly the headportions 51 and the upper shank portions 46. The vacuum created bysuction through intake 112 draws in air, shown by arrows 130, throughthe opening 105. The air passes over the nails 49 and provides thedesired benefits of wiping off excess coating composition from the nails49, thereby resulting in an even application of the coating composition120, as well as drying the coating composition, leaving the nails 49coated with the polymer composition coating 60, and cooling of thefastener assembly 50. As the nails 49 exit the opening 105 at the secondside wall 126, the additional air flow will typically provide sufficientadditional drying of the coating composition and cooling of the fastenerassembly so that the fastener assembly can be cut into the desired sizefor sale and packaged without additional substantial drying or cooling.

As will be appreciated by one skilled in the art following thedisclosure herein provided, the coating composition of this inventioncan be applied by vacuum coating to only the head, the tip, or the upperor lower shank portion of each fastener, as well as combinations ofthese fastener parts. To apply the coating composition to the tip andlower shank portion of each fastener, for example, the tip and the lowershank portion of each fastener can be run through the coating chamber.For example, the vacuum coating apparatus 100 shown in FIGS. 3 and 4 canbe positioned on the opposite side of the conveyor bands 75 so that thetips 47 and the lower shank portions 48 travel through the coatingchamber 104. In another embodiment, a second vacuum coating apparatuscan be positioned on the other side of the conveyor bands from thevacuum coating apparatus to coat both the heads and/or upper shankportions as well as the tips and/or lower shank portions.

While the embodiments of the invention described herein are presentlypreferred, various modifications and improvements can be made withoutdeparting from the spirit and scope of the invention. The scope of theinvention is indicated by the appended claims, and all changes that fallwithin the meaning and range of equivalents are intended to be embracedtherein.

1. A fastener assembly, comprising: a plurality of plated fastenersarranged in a row, each of the plated fasteners including a shank, ahead connected to the shank, a tip at an end of the shank opposite thehead, and a single protective plating, the protective plating consistingessentially of zinc; a collation component bonded to the shanks of theplated fasteners and maintaining the plated fasteners in the row; and apolymer composition applied directly to the single protective platingand coating the head and a portion of to shank, the polymer compositionconsisting essentially of about 50-95% by weight of a polymer materialand about 5-50% by weight metal particles which consist of aluminum, andcovering less than 50% of a total length of each fastener.
 2. Thefastener assembly of claim 1, wherein the coated portion of the shankincludes at least one of a portion of the shank between the head and thecollation component and a portion of the shank between the tip and thecollation component.
 3. The fastener assembly of claim 1, wherein thepolymer material comprises a polyurethane polymer.
 4. The fastenerassembly of claim 3, wherein the polymer material comprises an aliphaticpolyurethane polymer.
 5. The fastener assembly of claim 1, wherein thepolymer composition comprises about 70% to about 95% by weight of thepolymer material and about 5% to about 30% by weight of the metalparticles.
 6. The fastener assembly of claim 1, wherein the polymercomposition comprises about 80% to about 90% by weight of the polymermaterial and about 10% to about 20% by weight of the metal particles. 7.The fastener assembly of claim 1, wherein about 10% to about 20% of atotal length of each fastener is coated with the polymer composition. 8.The fastener assembly of claim 1, wherein about ⅜ inch or less of alength of the shank directly adjacent to at least one of the head andthe tip of each fastener is coated with the polymer composition.
 9. Thefastener assembly of claim 1, wherein a portion of each fastener shankbonded to the collation component is not coated with the polymercomposition.
 10. The fastener assembly of claim 1, wherein the polymercomposition is dispersed in water.
 11. The fastener assembly of claim10, wherein the polymer composition comprises an aliphatic polyurethanepolymer.
 12. The fastener assembly of claim 10, wherein the polymercomposition comprises about 80% to about 95% by weight polyurethane andabout 5% to about 20% by weight of the metal particles.
 13. The fastenerassembly of claim 1, wherein the polymer composition additionallycomprises a filler material selected from the group consisting ofcorrosion protection materials, ultraviolet protection materials, andcombinations thereof.
 14. The fastener assembly of claim 1, wherein thecollation component is a collating tape.
 15. The fastener assembly ofclaim 1, wherein the nails are slanted relative to the collationcomponent.
 16. The fastener assembly of claim 15, wherein the nails havea degree of slant of about 10-40 degrees.
 17. The fastener assembly ofclaim 15, wherein the nails have a degree of slant of about 15-25degrees.
 18. The fastener assembly of claim 1, wherein the metalparticles have an average particle diameter of 1-100 microns.
 19. Thefastener assembly of claim 18, wherein the average particle diameter is5-75 microns.
 20. The fastener assembly of claim 18, wherein the averageparticle diameter is 10-50 microns.
 21. The fastener assembly of claim1, wherein the polymer composition coating has a thickness of about0.25-5 mils.
 22. The fastener assembly of claim 1, wherein the polymercomposition coating has a thickness of about 0.1-3 mils.
 23. Thefastener assembly of claim 1, wherein the single protective platingcomprises galvanized zinc.